击针是汉语词汇，解释为闭锁机构中撞击底火的尖锁。
应用水阻力估算公式，建立击针在运动过程中考虑水阻力时的运动学方程。
An estimated resistance formula was used to establish the firing pin's kinematic equations in which the water-resistance was calculated.
事实上，这样的话闪电就不会击到房子上了，而是通过避雷针再通过导线传到大地。所以呢，闪电就无法造成伤害了。
In fact, now lighting will not hit the house. it hits the rod instead. The lightning goes down the rod and down the wire. it ends up in the ground. here, the lightning can't hurt anything.
易建联嘴唇被肘击缝了50针。
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